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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2009 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. #ifndef LP_FENCE_H
  30. #define LP_FENCE_H
  31.  
  32.  
  33. #include "os/os_thread.h"
  34. #include "pipe/p_state.h"
  35. #include "util/u_inlines.h"
  36.  
  37.  
  38. struct pipe_screen;
  39.  
  40.  
  41. struct lp_fence
  42. {
  43.    struct pipe_reference reference;
  44.    unsigned id;
  45.  
  46.    pipe_mutex mutex;
  47.    pipe_condvar signalled;
  48.  
  49.    boolean issued;
  50.    unsigned rank;
  51.    unsigned count;
  52. };
  53.  
  54.  
  55. struct lp_fence *
  56. lp_fence_create(unsigned rank);
  57.  
  58.  
  59. void
  60. lp_fence_signal(struct lp_fence *fence);
  61.  
  62. boolean
  63. lp_fence_signalled(struct lp_fence *fence);
  64.  
  65. void
  66. lp_fence_wait(struct lp_fence *fence);
  67.  
  68. void
  69. llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen);
  70.  
  71.  
  72. void
  73. lp_fence_destroy(struct lp_fence *fence);
  74.  
  75. static INLINE void
  76. lp_fence_reference(struct lp_fence **ptr,
  77.                    struct lp_fence *f)
  78. {
  79.    struct lp_fence *old = *ptr;
  80.  
  81.    if (pipe_reference(&old->reference, &f->reference)) {
  82.       lp_fence_destroy(old);
  83.    }
  84.    
  85.    *ptr = f;
  86. }
  87.  
  88. static INLINE boolean
  89. lp_fence_issued(const struct lp_fence *fence)
  90. {
  91.    return fence->issued;
  92. }
  93.  
  94.  
  95. #endif /* LP_FENCE_H */
  96.